Although you may not realize it on the surface, DevHub, the free site builder and hosting platform, is effectively a very sophisticated mashup using over 40 different external APIs. The Seattle-based startup, now with 10,000 site publishers who've built over 100,000 sites, have recently launched a major upgrade with new site editing tools, more content (API) partners, and new monetization tools. Their core offering takes data from APIs and other content sources as a way for niche publishers quickly create content-rich sites along with built-in monetization options:

Printful, a drop shipping service for custom print products and a product of the same team who created Startup Vitamins and BeHappy.me, has provided the Printful API that will allow people to easily integrate the functionality with their websites and applications. The service is specifically aimed at small and medium websites that want to offer print products, but don't want to handle the fulfillment and shipping of those products.